Please note:It is important to remember that alcohol levels can continue to rise after an individual has consumed alcohol, and that the levels may continue to rise after you have performed a breath alcohol test. Any alcohol in the blood impairs an individuals ability to perform a task and increases the chances of having an accident. In view of this if any alcohol is detected by the breathalyser, even if the colour change indicates that the level is low, we advise that the individual should not drive or operate machinery.